{"id":1291,"date":"2020-08-19T13:22:55","date_gmt":"2020-08-19T04:22:55","guid":{"rendered":"https:\/\/www.kwonline.org\/memo2\/?p=1291"},"modified":"2020-08-21T16:23:43","modified_gmt":"2020-08-21T07:23:43","slug":"howto-dedup-array-in-javascript","status":"publish","type":"post","link":"https:\/\/www.kwonline.org\/memo2\/2020\/08\/19\/howto-dedup-array-in-javascript\/","title":{"rendered":"Javascript\u3067\u914d\u5217\u5185\u306e\u91cd\u8907\u3092\u9664\u53bb\u3059\u308b"},"content":{"rendered":"<p>uniq\u30b3\u30de\u30f3\u30c9\u307f\u305f\u3044\u306a\u4fbf\u5229\u306a\u5974\u304c\u306a\u3044\u306e\u3067\u30e1\u30e2<\/p>\n<p>&nbsp;<\/p>\n<h3>1. <a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array\/filter\" rel=\"noopener noreferrer\" target=\"_blank\">filter<\/a>\u3092\u4f7f\u3046<\/h3>\n<pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\r\nvar ary = &#x5B;1, 2, 2, 3, 4, 3];\r\nary = ary.filter((x, y) =&gt; {\r\n    return ary.indexOf(x) === y;\r\n});\r\n\/\/&#x5B; 1, 2, 3, 4 ]\r\n<\/pre>\n<p>&nbsp;<\/p>\n<h3>2. <a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array\/reduce\" rel=\"noopener noreferrer\" target=\"_blank\">reduce<\/a>\u3092\u4f7f\u3046<\/h3>\n<pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\r\nvar ary = &#x5B;1, 2, 2, 3, 4, 3];\r\nary = ary.reduce((x, y) =&gt; {\r\n    return x.includes(y) ? x : &#x5B;...x, y];\r\n}, &#x5B;]);\r\n\/\/&#x5B; 1, 2, 3, 4 ]\r\n<\/pre>\n<p>&nbsp;<\/p>\n<h3>3. <a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Set\" rel=\"noopener noreferrer\" target=\"_blank\">Set<\/a>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u3046<\/h3>\n<pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\r\nlet ary = &#x5B;1, 2, 2, 3, 4, 3];\r\nary = Array.from(new Set(ary));\r\n\/\/&#x5B; 1, 2, 3, 4 ]\r\n<\/pre>\n<p>&nbsp;<br \/>\nIE\uff1f\u306a\u306b\u305d\u308c\uff1f<br \/>\n&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>uniq\u30b3\u30de\u30f3\u30c9\u307f\u305f\u3044\u306a\u4fbf\u5229\u306a\u5974\u304c\u306a\u3044\u306e\u3067\u30e1\u30e2 &nbsp; 1. filter\u3092\u4f7f\u3046 var ary = &#x5B;1, 2, 2, 3, 4, 3]; ary = ary.filter((x, y) =&gt; { [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-1291","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/www.kwonline.org\/memo2\/wp-json\/wp\/v2\/posts\/1291","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kwonline.org\/memo2\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kwonline.org\/memo2\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kwonline.org\/memo2\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kwonline.org\/memo2\/wp-json\/wp\/v2\/comments?post=1291"}],"version-history":[{"count":10,"href":"https:\/\/www.kwonline.org\/memo2\/wp-json\/wp\/v2\/posts\/1291\/revisions"}],"predecessor-version":[{"id":1303,"href":"https:\/\/www.kwonline.org\/memo2\/wp-json\/wp\/v2\/posts\/1291\/revisions\/1303"}],"wp:attachment":[{"href":"https:\/\/www.kwonline.org\/memo2\/wp-json\/wp\/v2\/media?parent=1291"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kwonline.org\/memo2\/wp-json\/wp\/v2\/categories?post=1291"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kwonline.org\/memo2\/wp-json\/wp\/v2\/tags?post=1291"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}